Effects of laser power density on static and dynamic mechanical properties of dissimilar stainless steel welded joints

• Published in: Acta mechanica Sinica Vol. 28; no. 5; pp. 1334 - 1339
• Main Authors: Wei, Yan-Peng, Li, Mao-Hui, Yu, Gang, Wu, Xian-Qian, Huang, Chen-Guang, Duan, Zhu-Ping
• Format: Journal Article
• Language: English
• Published: Heidelberg The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences 01.10.2012
• Subjects: Austenitic stainless steels; Classical and Continuum Physics; CO2激光; Computational Intelligence; Density; Engineering; Engineering Fluid Dynamics; Impact loading; Laser beam welding; Mechanical properties; Research Paper; Stainless steels; Strain rate; Theoretical and Applied Mechanics; Welded joints; 不锈钢; 动态力学性能; 工程设计; 应变速率敏感性; 激光功率密度; 焊接接头; 静态力学性能; Power density; Dynamic mechanics; Laser welding; Strain rate
• ISSN: 0567-7718; 1614-3116
• DOI: 10.1007/s10409-012-0080-0

The mechanical properties of laser welded joints under impact loadings such as explosion and car crash etc. are critical for the engineering designs. The hardness, static and dynamic mechanical properties of AISI304 and AISI316L dissimilar stainless steel welded joints by CO2 laser were experimentally studied. The dynamic strainstress curves at the strain rate around 103 s-1 were obtained by the split Hopkinson tensile bar （SHTB）. The static mechanical properties of the welded joints have little changes with the laser power density and all fracture occurs at 316 L side. However, the strain rate sensitivity has a strong depen- dence on laser power density. The value of strain rate factor decreases with the increase of laser power density. The welded joint which may be applied for the impact loading can be obtained by reducing the laser power density in the case of welding quality assurance.